Based on the fossil record of the Rhynie cherts, what structures were present in the earliest vascular plants? Select all correct choices
A. stomata
B. cuticles
C. extensive root systems
D. multi-veined leaves
E. sporangia
A,B,E
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The parent material layer of a soil is composed of weathered
A. humus. B. organic detritus and roots. C. residual aluminum and iron. D. soil. E. rock fragments.
Why is ATP needed for muscle contraction?
A) It causes tropomyosin to slide off the myosin-binding sites of actin. B) It's needed for calcium release from the sarcoplasmic reticulum. C) It causes calcium to bind to troponin. D) Myosin must contact the actin filament and move to pull it toward the midline of the sarcomere.
Members of the class ________, which include octopuses, squids, and nautiluses, are highly intelligent.
What will be an ideal response?
What part of the fish brain processes information from the eyes?
A) eyes B) optic lobe C) olfactory lobe D) gills